JP2001205527A - Machine tool and method of clamping table of machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of fixing a table such as a turntable. SOLUTION: Clamp devices 14 anchored onto a base 1 fix a turntable 8 about the circumference thereof, so that a long distance D can be ensured from the center 8a of turntable rotation to the turntable restraining positions. The turntable can be thus fixed appreciably rigidly as a fixed work holder or like a surface plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for clamping and fixing a table of a machine tool when the table is used, and a machine tool provided with a clamp device for performing the method. .

[0002]

2. Description of the Related Art FIG. 3 shows an example of a portal-type turning center as an example of a portal-type machine tool. The turning center shown here comprises a column 3 movable along a pair of X-axis linear guide rails 2 provided on a foundation 1 and a Y-axis linear guide rail 4 movable along a column 3 in the Z-axis direction.
And a saddle 5 movable along the Y-axis linear guide rail 4 in the Y-axis direction, and a ram 6 provided on the saddle 5 and movable in the Z-axis direction. The ram 6 is provided with a main shaft that rotationally drives the tool 7. The foundation 1 is provided with a turntable 8 via a bed (not visible in FIG. 3).

In this turning center, during normal use, a work is placed and fixed on a turntable 8, and a tool is driven by the rotation of the turntable 8 and a driving mechanism in the XYZ directions composed of the members 2 to 6 described above. The work is processed by appropriately combining the movements of the seven positions.

This turning center can be used for machining a work much larger than the turntable 8 if the turntable 8 is used without being rotated.
In the case of such usage, the following method is conventionally employed. That is, as shown in FIG. 4, first, a surface plate 10 having an upper surface having substantially the same height as the upper surface of the turntable 8 is fixed on the foundation 1 with bolts. Then, the fixing flange 12 provided at the lower portion of the turntable 8 is fixed by the clamp device 11 provided on the side portion of the bed 9, and the turntable 8 is non-rotatably fixed. That is, the turntable 8 is immobilized to have a function as a surface plate. Then, turntable 8 and surface plate 1
The work is placed on the workpiece 0, fixed, and processed.

However, in the conventional method shown here, the distance d from the rotation center 8a of the turntable 8 to the restrained position of the turntable 8 cannot be made large, so that
There is a problem that the turntable 8 cannot be fixed firmly.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and a technique for firmly fixing a table such as a turntable when the table is used in a fixed manner. The purpose is to provide.

[0007]

In order to achieve the above object, the present invention provides a method for clamping a table of a machine tool comprising a bed fixed to a foundation and a table movably mounted on the bed. The method is characterized in that a clamping device is provided on the foundation, and the outer portion of the table is clamped by the clamping device.

Further, the present invention relates to a machine tool, a bed fixed to a foundation, a table movably mounted on the bed, and a clamp device provided on the foundation and clamping an outer portion of the table. And the second feature.

The table may be a turntable, and in this case, it is preferable that the clamping device clamps the vicinity of the outer periphery of the turntable.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are diagrams showing an embodiment of the present invention. In FIGS. 1 and 2 for explaining the present embodiment, the same members as those shown in FIGS. 3 and 4 are denoted by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a view showing the same cross section as FIG. 3 showing the prior art. As shown in FIG. 1, a fixing flange 13 is provided near the outer periphery of the turntable 8 and below the turntable 8. Further, a plurality of clamp devices 14 for clamping the fixing flange 13 are attached to the foundation 1.

As shown in FIG. 1, the vicinity of the outer periphery of the turntable 8 is fixed by a clamp device 14 attached to the foundation 1, so that the rotation center 8a of the turntable 8 is rotated.
The distance D from the position to the restraint position of the turntable 8 can be increased. For this reason, the turntable 8 can be fixed firmly enough to achieve the purpose of using it as a fixed work mounting table, that is, like a surface plate.

Further, since the turntable 8 is directly fixed to the foundation 1 without passing through the bed 9, the turntable 8 can be fixed more firmly.

A clamping device 1 schematically shown in FIG.
4 can be configured, for example, as shown in FIG.
That is, a pair of hydraulic cylinders 15
16 are provided, and holding plates 15a and 16a are provided at the ends of the cylinder rods of the cylinders 15 and 16, respectively. In this case, the turntable 8 can be firmly fixed to the foundation 1 by operating the cylinders 15 and 16 in the opposite directions and sandwiching the fixing flange 13 between the holding plates 15a and 16a.

Although the above embodiment has been described with reference to a case where the table is a turntable, the table may be a table that performs a linear motion. In the specification, the term “table” means a movable work mounting table, and is used in a sense that does not include a fixed work mounting table.

[0016]

As described above, according to the present invention,
The table can be fixed firmly.

[Brief description of the drawings]

FIG. 1 is a view for explaining a table fixing method according to the present invention.

FIG. 2 is a diagram illustrating an example of a configuration of a clamp device.

FIG. 3 is a diagram showing an example of a machine tool to which the present invention is applied.

4 is a view for explaining a conventional table fixing method, and is a view showing a cross section taken along line IV-IV in FIG. 3;

[Explanation of symbols]

 1 foundation 8 table (turntable) 9 bed 14 clamp device

Claims (4)

[Claims] 1. A method of clamping a table of a machine tool having a bed fixed to a foundation and a table movably mounted on the bed, comprising: a clamping device provided on the foundation; Clamping the outer part of the table by means of the method. 2. The method according to claim 1, wherein the table is a turntable, and the clamping device clamps a portion of the turntable near its outer periphery. 3. A bed fixed to a foundation, a table movably mounted on the bed, and a clamp device provided on the foundation and clamping an outer portion of the table. And machine tools. 4. The method according to claim 1, wherein the table is a turntable, and the clamping device clamps a portion of the turntable near its outer periphery.